Has been everywhere I've used it, works well and is very handy. Something could still improve the slide, on the one on and off the device. The road between ON and OFF is so short that it happened to me once that the device has been turned on by pushing in the protective sleeve again. As for the functions, everything is almost perfect. Missing I do I only be able to forward to specific slides and jump back (not only to the two directly adjacent), how it is possible with a mouse.